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Rhino is an open-source implementation of JavaScript written entirely in Java. It is typically embedded into Java applications to provide scripting to end users.
/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Rhino code, released
* May 6, 1999.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1997-1999
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Norris Boyd
* Igor Bukanov
*
* Alternatively, the contents of this file may be used under the terms of
* the GNU General Public License Version 2 or later (the "GPL"), in which
* case the provisions of the GPL are applicable instead of those above. If
* you wish to allow use of your version of this file only under the terms of
* the GPL and not to allow others to use your version of this file under the
* MPL, indicate your decision by deleting the provisions above and replacing
* them with the notice and other provisions required by the GPL. If you do
* not delete the provisions above, a recipient may use your version of this
* file under either the MPL or the GPL.
*
* ***** END LICENSE BLOCK ***** */
package org.mozilla.javascript;
import java.io.Serializable;
/**
* This class implements the object lookup required for the
* with statement.
* It simply delegates every action to its prototype except
* for operations on its parent.
*/
public class NativeWith implements Scriptable, IdFunctionCall, Serializable {
private static final long serialVersionUID = 1L;
static void init(Scriptable scope, boolean sealed)
{
NativeWith obj = new NativeWith();
obj.setParentScope(scope);
obj.setPrototype(ScriptableObject.getObjectPrototype(scope));
IdFunctionObject ctor = new IdFunctionObject(obj, FTAG, Id_constructor,
"With", 0, scope);
ctor.markAsConstructor(obj);
if (sealed) {
ctor.sealObject();
}
ctor.exportAsScopeProperty();
}
private NativeWith() {
}
protected NativeWith(Scriptable parent, Scriptable prototype) {
this.parent = parent;
this.prototype = prototype;
}
public String getClassName() {
return "With";
}
public boolean has(String id, Scriptable start)
{
return prototype.has(id, prototype);
}
public boolean has(int index, Scriptable start)
{
return prototype.has(index, prototype);
}
public Object get(String id, Scriptable start)
{
if (start == this)
start = prototype;
return prototype.get(id, start);
}
public Object get(int index, Scriptable start)
{
if (start == this)
start = prototype;
return prototype.get(index, start);
}
public void put(String id, Scriptable start, Object value)
{
if (start == this)
start = prototype;
prototype.put(id, start, value);
}
public void put(int index, Scriptable start, Object value)
{
if (start == this)
start = prototype;
prototype.put(index, start, value);
}
public void delete(String id)
{
prototype.delete(id);
}
public void delete(int index)
{
prototype.delete(index);
}
public Scriptable getPrototype() {
return prototype;
}
public void setPrototype(Scriptable prototype) {
this.prototype = prototype;
}
public Scriptable getParentScope() {
return parent;
}
public void setParentScope(Scriptable parent) {
this.parent = parent;
}
public Object[] getIds() {
return prototype.getIds();
}
public Object getDefaultValue(Class typeHint) {
return prototype.getDefaultValue(typeHint);
}
public boolean hasInstance(Scriptable value) {
return prototype.hasInstance(value);
}
/**
* Must return null to continue looping or the final collection result.
*/
protected Object updateDotQuery(boolean value)
{
// NativeWith itself does not support it
throw new IllegalStateException();
}
public Object execIdCall(IdFunctionObject f, Context cx, Scriptable scope,
Scriptable thisObj, Object[] args)
{
if (f.hasTag(FTAG)) {
if (f.methodId() == Id_constructor) {
throw Context.reportRuntimeError1("msg.cant.call.indirect", "With");
}
}
throw f.unknown();
}
static boolean isWithFunction(Object functionObj)
{
if (functionObj instanceof IdFunctionObject) {
IdFunctionObject f = (IdFunctionObject)functionObj;
return f.hasTag(FTAG) && f.methodId() == Id_constructor;
}
return false;
}
static Object newWithSpecial(Context cx, Scriptable scope, Object[] args)
{
ScriptRuntime.checkDeprecated(cx, "With");
scope = ScriptableObject.getTopLevelScope(scope);
NativeWith thisObj = new NativeWith();
thisObj.setPrototype(args.length == 0
? ScriptableObject.getClassPrototype(scope,
"Object")
: ScriptRuntime.toObject(cx, scope, args[0]));
thisObj.setParentScope(scope);
return thisObj;
}
private static final Object FTAG = new Object();
private static final int
Id_constructor = 1;
protected Scriptable prototype;
protected Scriptable parent;
}